glclearcolor(3g) [xfree86 man page]

GLCLEARCOLOR(3G)														  GLCLEARCOLOR(3G)

NAME

       glClearColor - specify clear values for the color buffers

C SPECIFICATION

       void glClearColor( GLclampf red,
			  GLclampf green,
			  GLclampf blue,
			  GLclampf alpha )

PARAMETERS

       red, green, blue, alpha
			     Specify  the  red, green, blue, and alpha values used when the color buffers are cleared.	The initial values are all
			     0.

DESCRIPTION

       glClearColor specifies the red, green, blue, and alpha values used by glClear to clear the color buffers.  Values specified by glClearColor
       are clamped to the range [0, 1].

ERRORS

       GL_INVALID_OPERATION is generated if glClearColor is executed between the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS

       glGet with argument GL_COLOR_CLEAR_VALUE

SEE ALSO

       glClear(3G)

																  GLCLEARCOLOR(3G)

GLCOLORMASK(3G) 														   GLCOLORMASK(3G)

NAME

       glColorMask - enable and disable writing of frame buffer color components

C SPECIFICATION

       void glColorMask( GLboolean red,
			 GLboolean green,
			 GLboolean blue,
			 GLboolean alpha )

PARAMETERS

       red, green, blue, alpha
			     Specify  whether  red, green, blue, and alpha can or cannot be written into the frame buffer.  The initial values are
			     all GL_TRUE, indicating that the color components can be written.

DESCRIPTION

       glColorMask specifies whether the individual color components in the frame buffer can or cannot be written.  If red is GL_FALSE, for  exam-
       ple, no change is made to the red component of any pixel in any of the color buffers, regardless of the drawing operation attempted.

       Changes to individual bits of components cannot be controlled.  Rather, changes are either enabled or disabled for entire color components.

ERRORS

       GL_INVALID_OPERATION is generated if glColorMask is executed between the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS

       glGet with argument GL_COLOR_WRITEMASK
       glGet with argument GL_RGBA_MODE

SEE ALSO

       glClear(3G), glColor(3G), glColorPointer(3G), glDepthMask(3G), glIndex(3G), glIndexPointer(3G), glIndexMask(3G), glStencilMask(3G)

																   GLCOLORMASK(3G)